I´m visiting sister´s family for a week. How can I be a good house guest w/

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consideration of their finances? My sister and her family live in Florida, and I am staying with them for a 6 days and 7 nights. I know my sister won´t let me give them money for staying there to cover expenses so I have an idea. She and her husband have 4 kids, so I was going to cook a huge meal one night for all of us plus give them a great gift basket.
Do you think this is enough, or shall I do more?